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feat: add undo!

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Allows using `undo!` to undo changes and remove them from the undo-tree. Can only be used for moving backwards in the same undo branch.
This commit is contained in:
Famiu Haque
2022-04-18 09:02:32 +06:00
parent 0124a7bfa9
commit 1e3d9c7dbc
5 changed files with 113 additions and 5 deletions
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67
test/functional/editor/undo_spec.lua
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@@ -2,9 +2,18 @@ local helpers = require('test.functional.helpers')(after_each)
local clear = helpers.clear
local command = helpers.command
local eval = helpers.eval
local expect = helpers.expect
local eq = helpers.eq
local feed = helpers.feed
local feed_command = helpers.feed_command
local insert = helpers.insert
local funcs = helpers.funcs
local function lastmessage()
local messages = funcs.split(funcs.execute('messages'), '\n')
return messages[#messages]
end
describe('u CTRL-R g- g+', function()
before_each(clear)
@@ -59,3 +68,61 @@ describe('u CTRL-R g- g+', function()
undo_and_redo(4, 'g-', 'g+', '1')
end)
end)
describe(':undo! command', function()
before_each(function()
clear()
feed('i1 little bug in the code<Esc>')
feed('o1 little bug in the code<Esc>')
feed('oTake 1 down, patch it around<Esc>')
feed('o99 little bugs in the code<Esc>')
end)
it('works', function()
feed_command('undo!')
expect([[
1 little bug in the code
1 little bug in the code
Take 1 down, patch it around]])
feed('<C-r>')
eq('Already at newest change', lastmessage())
end)
it('works with arguments', function()
feed_command('undo! 2')
expect([[
1 little bug in the code
1 little bug in the code]])
feed('<C-r>')
eq('Already at newest change', lastmessage())
end)
it('correctly sets alternative redo', function()
feed('uo101 little bugs in the code<Esc>')
feed_command('undo!')
feed('<C-r>')
expect([[
1 little bug in the code
1 little bug in the code
Take 1 down, patch it around
99 little bugs in the code]])
feed('uuoTake 2 down, patch them around<Esc>')
feed('o101 little bugs in the code<Esc>')
feed_command('undo! 2')
feed('<C-r><C-r>')
expect([[
1 little bug in the code
1 little bug in the code
Take 1 down, patch it around
99 little bugs in the code]])
end)
it('fails when attempting to redo or move to different undo branch', function()
feed_command('undo! 4')
eq('E5767: Cannot use :undo! to redo or move to a different undo branch', eval('v:errmsg'))
feed('u')
feed_command('undo! 4')
eq('E5767: Cannot use :undo! to redo or move to a different undo branch', eval('v:errmsg'))
feed('o101 little bugs in the code<Esc>')
feed('o101 little bugs in the code<Esc>')
feed_command('undo! 4')
eq('E5767: Cannot use :undo! to redo or move to a different undo branch', eval('v:errmsg'))
end)
end)